Rich or lean?

[ch47600]

I was driving home today after about an hour drive and when I pulled into the neighbor the car really bogged down under a heavy load. If I feathered the gas it ran decent but if you trounced on it the car bogged down then sputtered and took off.

The car has always ran very rich due to the FMU and bucks in first as you let the clutch out. However, I'm thinking that the car leaned out. Considering that this is the first time I've experienced this I'm not thinking that it's the fuel pump but maybe a sensor.

Here's what I'm running:
155 LPH fuel pump, 5 LB Powerdyne blower, B cam, everything else is stock. I've ran this set up for 3 years now, no problems. It's in deserate need of a bunch of stuff (heads, intake, MAF, throttle body, larger injectors) but this is weird.

Any thoughts?

 

[Black1987Stang]

I used to have kind of the same deal, I told all my friends I had VTEC joking around haha, I would gun it, it would load up for a sec or do whatever it did and then It just took off like i spray a shot of nitrous in or something , a few times i got the tires to chirp when it did that

Try pulling the codes and post them up...Mine started doing it out of nowhere, lasted about 3 weeks and also disappeared out of nowhere too that was with my stock motor, now i got a different setup in

 

[5.0 Nostalgia]

I would pull all the plugs and see what they look like.

 

[matm347]

the bucking is a lean condition, with your larger than stock cam I would say you need some more fuel down low as larger cams tend to require. I could only fix my bucking/bad low end performance with a tweecer tune. No fuel pressure adjustment/tps could.

 

[90mustangGT]

Check your TPS. (throttle position sensor)
Check codes.